blob: 7ab5ea155452c5b745041e05c155df0ded2dd2c4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 md_k.h : kernel internal structure of the Linux MD driver
3 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 You should have received a copy of the GNU General Public License
11 (for example /usr/src/linux/COPYING); if not, write to the Free
12 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
13*/
14
Christoph Hellwig63fe0812009-04-14 12:01:53 +100015#ifndef _MD_MD_H
16#define _MD_MD_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Christoph Hellwig63fe0812009-04-14 12:01:53 +100018#include <linux/blkdev.h>
19#include <linux/kobject.h>
20#include <linux/list.h>
21#include <linux/mm.h>
22#include <linux/mutex.h>
23#include <linux/timer.h>
24#include <linux/wait.h>
25#include <linux/workqueue.h>
David Howells93614012006-09-30 20:45:40 +020026
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#define MaxSector (~(sector_t)0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029typedef struct mddev_s mddev_t;
30typedef struct mdk_rdev_s mdk_rdev_t;
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 * MD's 'extended' device
34 */
35struct mdk_rdev_s
36{
37 struct list_head same_set; /* RAID devices within the same set */
38
Andre Nolldd8ac332009-03-31 14:33:13 +110039 sector_t sectors; /* Device size (in 512bytes sectors) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 mddev_t *mddev; /* RAID array if running */
NeilBrowneea1bf32009-03-31 14:27:02 +110041 int last_events; /* IO event timestamp */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43 struct block_device *bdev; /* block device handle */
44
45 struct page *sb_page;
46 int sb_loaded;
NeilBrown42543762006-06-26 00:27:57 -070047 __u64 sb_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 sector_t data_offset; /* start of data in array */
Andre Noll0f420352008-07-11 22:02:23 +100049 sector_t sb_start; /* offset of the super block (in 512byte sectors) */
NeilBrown0002b272005-09-09 16:23:53 -070050 int sb_size; /* bytes in the superblock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 int preferred_minor; /* autorun support */
52
NeilBrown86e6ffd2005-11-08 21:39:24 -080053 struct kobject kobj;
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 /* A device can be in one of three states based on two flags:
56 * Not working: faulty==1 in_sync==0
57 * Fully working: faulty==0 in_sync==1
58 * Working, but not
59 * in sync with array
60 * faulty==0 in_sync==0
61 *
62 * It can never have faulty==1, in_sync==1
63 * This reduces the burden of testing multiple flags in many cases
64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
NeilBrownb2d444d2005-11-08 21:39:31 -080066 unsigned long flags;
67#define Faulty 1 /* device is known to have a fault */
68#define In_sync 2 /* device is in_sync with rest of array */
NeilBrown8ddf9ef2005-09-09 16:23:45 -070069#define WriteMostly 4 /* Avoid reading if at all possible */
NeilBrowna9701a32005-11-08 21:39:34 -080070#define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */
NeilBrownc5d79ad2008-02-06 01:39:54 -080071#define AllReserved 6 /* If whole device is reserved for
72 * one array */
NeilBrownd0fae182008-03-04 14:29:31 -080073#define AutoDetected 7 /* added by auto-detect */
Dan Williams6bfe0b42008-04-30 00:52:32 -070074#define Blocked 8 /* An error occured on an externally
75 * managed array, don't allow writes
76 * until it is cleared */
77 wait_queue_head_t blocked_wait;
NeilBrown8ddf9ef2005-09-09 16:23:45 -070078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 int desc_nr; /* descriptor index in the superblock */
80 int raid_disk; /* role of device in array */
NeilBrown41158c72005-06-21 17:17:25 -070081 int saved_raid_disk; /* role that device used to have in the
82 * array and could again if we did a partial
83 * resync from the bitmap
84 */
NeilBrown5fd6c1d2006-06-26 00:27:40 -070085 sector_t recovery_offset;/* If this device has been partially
86 * recovered, this is where we were
87 * up to.
88 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90 atomic_t nr_pending; /* number of pending requests.
91 * only maintained for arrays that
92 * support hot removal
93 */
NeilBrownba22dcb2005-11-08 21:39:31 -080094 atomic_t read_errors; /* number of consecutive read errors that
95 * we have tried to ignore.
96 */
Robert Becker1e509152009-12-14 12:49:58 +110097 struct timespec last_read_error; /* monotonic time since our
98 * last read error
99 */
NeilBrown4dbcdc72006-01-06 00:20:52 -0800100 atomic_t corrected_errors; /* number of corrected read errors,
101 * for reporting to userspace and storing
102 * in superblock.
103 */
NeilBrown5792a282007-04-04 19:08:18 -0700104 struct work_struct del_work; /* used for delayed sysfs removal */
NeilBrown3c0ee632008-10-21 13:25:28 +1100105
106 struct sysfs_dirent *sysfs_state; /* handle for 'state'
107 * sysfs entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110struct mddev_s
111{
112 void *private;
NeilBrown2604b702006-01-06 00:20:36 -0800113 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 dev_t unit;
115 int md_minor;
116 struct list_head disks;
NeilBrown850b2b42006-10-03 01:15:46 -0700117 unsigned long flags;
118#define MD_CHANGE_DEVS 0 /* Some device status has changed */
119#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
120#define MD_CHANGE_PENDING 2 /* superblock update in progress */
121
NeilBrown409c57f2009-03-31 14:39:39 +1100122 int suspended;
123 atomic_t active_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 int ro;
125
126 struct gendisk *gendisk;
127
NeilBrowneae17012005-11-08 21:39:23 -0800128 struct kobject kobj;
NeilBrownd3374822009-01-09 08:31:10 +1100129 int hold_active;
130#define UNTIL_IOCTL 1
NeilBrownefeb53c2009-01-09 08:31:10 +1100131#define UNTIL_STOP 2
NeilBrowneae17012005-11-08 21:39:23 -0800132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 /* Superblock information */
134 int major_version,
135 minor_version,
136 patch_version;
137 int persistent;
NeilBrowne6910632008-02-06 01:39:51 -0800138 int external; /* metadata is
139 * managed externally */
140 char metadata_type[17]; /* externally set*/
Andre Noll9d8f0362009-06-18 08:45:01 +1000141 int chunk_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 time_t ctime, utime;
143 int level, layout;
NeilBrownd9d166c2006-01-06 00:20:51 -0800144 char clevel[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 int raid_disks;
146 int max_disks;
Andre Noll58c0fed2009-03-31 14:33:13 +1100147 sector_t dev_sectors; /* used size of
148 * component devices */
Andre Nollf233ea52008-07-21 17:05:22 +1000149 sector_t array_sectors; /* exported array size */
Dan Williamsb522adc2009-03-31 15:00:31 +1100150 int external_size; /* size managed
151 * externally */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 __u64 events;
NeilBrowna8707c02010-05-18 09:28:43 +1000153 /* If the last 'event' was simply a clean->dirty transition, and
154 * we didn't write it to the spares, then it is safe and simple
155 * to just decrement the event count on a dirty->clean transition.
156 * So we record that possibility here.
157 */
158 int can_decrease_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 char uuid[16];
161
NeilBrownf6705572006-03-27 01:18:11 -0800162 /* If the array is being reshaped, we need to record the
163 * new shape and an indication of where we are up to.
164 * This is written to the superblock.
165 * If reshape_position is MaxSector, then no reshape is happening (yet).
166 */
167 sector_t reshape_position;
Andre Noll664e7c42009-06-18 08:45:27 +1000168 int delta_disks, new_level, new_layout;
169 int new_chunk_sectors;
NeilBrownf6705572006-03-27 01:18:11 -0800170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 struct mdk_thread_s *thread; /* management thread */
172 struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */
NeilBrownff4e8d92006-07-10 04:44:16 -0700173 sector_t curr_resync; /* last block scheduled */
NeilBrown97e4f422009-03-31 14:33:13 +1100174 /* As resync requests can complete out of order, we cannot easily track
175 * how much resync has been completed. So we occasionally pause until
176 * everything completes, then set curr_resync_completed to curr_resync.
177 * As such it may be well behind the real resync mark, but it is a value
178 * we are certain of.
179 */
180 sector_t curr_resync_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 unsigned long resync_mark; /* a recent timestamp */
182 sector_t resync_mark_cnt;/* blocks written at resync_mark */
NeilBrownff4e8d92006-07-10 04:44:16 -0700183 sector_t curr_mark_cnt; /* blocks scheduled now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 sector_t resync_max_sectors; /* may be set by personality */
NeilBrown9d888832005-11-08 21:39:26 -0800186
187 sector_t resync_mismatches; /* count of sectors where
188 * parity/replica mismatch found
189 */
NeilBrowne464eaf2006-03-27 01:18:14 -0800190
191 /* allow user-space to request suspension of IO to regions of the array */
192 sector_t suspend_lo;
193 sector_t suspend_hi;
NeilBrown88202a02006-01-06 00:21:36 -0800194 /* if zero, use the system-wide default */
195 int sync_speed_min;
196 int sync_speed_max;
197
Bernd Schubert90b08712008-05-23 13:04:38 -0700198 /* resync even though the same disks are shared among md-devices */
199 int parallel_resync;
200
NeilBrown6ff8d8ec2006-01-06 00:20:15 -0800201 int ok_start_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 /* recovery/resync flags
203 * NEEDED: we might need to start a resync/recover
204 * RUNNING: a thread is running, or about to be started
205 * SYNC: actually doing a resync, not a recovery
Neil Brown72a23c22008-06-28 08:31:41 +1000206 * RECOVER: doing recovery, or need to try it.
NeilBrowndfc70642008-05-23 13:04:39 -0700207 * INTR: resync needs to be aborted for some reason
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 * DONE: thread is done and is waiting to be reaped
NeilBrown24dd4692005-11-08 21:39:26 -0800209 * REQUEST: user-space has requested a sync (used with SYNC)
Anand Gadiyar411c9402009-07-07 15:24:23 +0530210 * CHECK: user-space request for check-only, no repair
NeilBrownccfcc3c2006-03-27 01:18:09 -0800211 * RESHAPE: A reshape is happening
212 *
213 * If neither SYNC or RESHAPE are set, then it is a recovery.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 */
215#define MD_RECOVERY_RUNNING 0
216#define MD_RECOVERY_SYNC 1
Neil Brown72a23c22008-06-28 08:31:41 +1000217#define MD_RECOVERY_RECOVER 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218#define MD_RECOVERY_INTR 3
219#define MD_RECOVERY_DONE 4
220#define MD_RECOVERY_NEEDED 5
NeilBrown24dd4692005-11-08 21:39:26 -0800221#define MD_RECOVERY_REQUESTED 6
222#define MD_RECOVERY_CHECK 7
NeilBrownccfcc3c2006-03-27 01:18:09 -0800223#define MD_RECOVERY_RESHAPE 8
NeilBrown5fd6c1d2006-06-26 00:27:40 -0700224#define MD_RECOVERY_FROZEN 9
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 unsigned long recovery;
NeilBrown4044ba52009-01-09 08:31:11 +1100227 int recovery_disabled; /* if we detect that recovery
228 * will always fail, set this
229 * so we don't loop trying */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 int in_sync; /* know to not need resync */
NeilBrownc8c00a62009-08-10 12:50:52 +1000232 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
233 * that we are never stopping an array while it is open.
234 * 'reconfig_mutex' protects all other reconfiguration.
235 * These locks are separate due to conflicting interactions
236 * with bdev->bd_mutex.
237 * Lock ordering is:
238 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
239 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open
240 */
241 struct mutex open_mutex;
NeilBrowndf5b89b2006-03-27 01:18:20 -0800242 struct mutex reconfig_mutex;
NeilBrownf2ea68c2008-07-21 17:05:25 +1000243 atomic_t active; /* general refcount */
244 atomic_t openers; /* number of active opens */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 int degraded; /* whether md should consider
247 * adding a spare
248 */
NeilBrowna9701a32005-11-08 21:39:34 -0800249 int barriers_work; /* initialised to true, cleared as soon
250 * as a barrier request to slave
251 * fails. Only supported
252 */
253 struct bio *biolist; /* bios that need to be retried
254 * because BIO_RW_BARRIER is not supported
255 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 atomic_t recovery_active; /* blocks scheduled, but not written */
258 wait_queue_head_t recovery_wait;
259 sector_t recovery_cp;
Neil Brown5e96ee62008-06-28 08:31:24 +1000260 sector_t resync_min; /* user requested sync
261 * starts here */
NeilBrownc6207272008-02-06 01:39:52 -0800262 sector_t resync_max; /* resync should pause
263 * when it gets here */
NeilBrown06d91a52005-06-21 17:17:12 -0700264
NeilBrownb62b7592008-10-21 13:25:21 +1100265 struct sysfs_dirent *sysfs_state; /* handle for 'array_state'
266 * file in sysfs.
267 */
NeilBrown0c3573f2009-01-09 08:31:05 +1100268 struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */
NeilBrownb62b7592008-10-21 13:25:21 +1100269
NeilBrownd3374822009-01-09 08:31:10 +1100270 struct work_struct del_work; /* used for delayed sysfs removal */
271
NeilBrown06d91a52005-06-21 17:17:12 -0700272 spinlock_t write_lock;
NeilBrown3d310eb2005-06-21 17:17:26 -0700273 wait_queue_head_t sb_wait; /* for waiting on superblock updates */
NeilBrown7bfa19f2005-06-21 17:17:28 -0700274 atomic_t pending_writes; /* number of active superblock writes */
NeilBrown06d91a52005-06-21 17:17:12 -0700275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 unsigned int safemode; /* if set, update "clean" superblock
277 * when no writes pending.
278 */
279 unsigned int safemode_delay;
280 struct timer_list safemode_timer;
281 atomic_t writes_pending;
Jens Axboe165125e2007-07-24 09:28:11 +0200282 struct request_queue *queue; /* for plugging ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
NeilBrown32a76272005-06-21 17:17:14 -0700284 struct bitmap *bitmap; /* the bitmap for the device */
NeilBrownc3d97142009-12-14 12:49:52 +1100285 struct {
286 struct file *file; /* the bitmap file */
NeilBrownf6af9492009-12-14 12:49:54 +1100287 loff_t offset; /* offset from superblock of
NeilBrownc3d97142009-12-14 12:49:52 +1100288 * start of bitmap. May be
289 * negative, but not '0'
NeilBrownf6af9492009-12-14 12:49:54 +1100290 * For external metadata, offset
291 * from start of device.
NeilBrownc3d97142009-12-14 12:49:52 +1100292 */
NeilBrownf6af9492009-12-14 12:49:54 +1100293 loff_t default_offset; /* this is the offset to use when
NeilBrownc3d97142009-12-14 12:49:52 +1100294 * hot-adding a bitmap. It should
295 * eventually be settable by sysfs.
296 */
297 struct mutex mutex;
NeilBrown42a04b52009-12-14 12:49:53 +1100298 unsigned long chunksize;
299 unsigned long daemon_sleep; /* how many seconds between updates? */
300 unsigned long max_write_behind; /* write-behind mode */
NeilBrownece5cff2009-12-14 12:49:56 +1100301 int external;
NeilBrownc3d97142009-12-14 12:49:52 +1100302 } bitmap_info;
NeilBrown32a76272005-06-21 17:17:14 -0700303
Robert Becker1e509152009-12-14 12:49:58 +1100304 atomic_t max_corr_read_errors; /* max read retries */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 struct list_head all_mddevs;
NeilBrowna2826aa2009-12-14 12:49:49 +1100306
NeilBrowna64c8762010-04-14 17:15:37 +1000307 struct attribute_group *to_remove;
NeilBrowna2826aa2009-12-14 12:49:49 +1100308 /* Generic barrier handling.
309 * If there is a pending barrier request, all other
310 * writes are blocked while the devices are flushed.
311 * The last to finish a flush schedules a worker to
312 * submit the barrier request (without the barrier flag),
313 * then submit more flush requests.
314 */
315 struct bio *barrier;
316 atomic_t flush_pending;
317 struct work_struct barrier_work;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318};
319
320
321static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev)
322{
NeilBrownb2d444d2005-11-08 21:39:31 -0800323 int faulty = test_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
325 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
326}
327
328static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
329{
330 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
331}
332
NeilBrown2604b702006-01-06 00:20:36 -0800333struct mdk_personality
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
335 char *name;
NeilBrown2604b702006-01-06 00:20:36 -0800336 int level;
337 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 struct module *owner;
NeilBrown21a52c62010-04-01 15:02:13 +1100339 int (*make_request)(mddev_t *mddev, struct bio *bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 int (*run)(mddev_t *mddev);
341 int (*stop)(mddev_t *mddev);
342 void (*status)(struct seq_file *seq, mddev_t *mddev);
343 /* error_handler must set ->faulty and clear ->in_sync
344 * if appropriate, and should abort recovery if needed
345 */
346 void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev);
347 int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev);
348 int (*hot_remove_disk) (mddev_t *mddev, int number);
349 int (*spare_active) (mddev_t *mddev);
NeilBrown57afd892005-06-21 17:17:13 -0700350 sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 int (*resize) (mddev_t *mddev, sector_t sectors);
Dan Williams80c3a6c2009-03-17 18:10:40 -0700352 sector_t (*size) (mddev_t *mddev, sector_t sectors, int raid_disks);
NeilBrown63c70c42006-03-27 01:18:13 -0800353 int (*check_reshape) (mddev_t *mddev);
354 int (*start_reshape) (mddev_t *mddev);
NeilBrowncea9c222009-03-31 15:15:05 +1100355 void (*finish_reshape) (mddev_t *mddev);
NeilBrown36fa3062005-09-09 16:23:45 -0700356 /* quiesce moves between quiescence states
357 * 0 - fully active
358 * 1 - no new requests allowed
359 * others - reserved
360 */
361 void (*quiesce) (mddev_t *mddev, int state);
NeilBrown245f46c2009-03-31 14:39:39 +1100362 /* takeover is used to transition an array from one
363 * personality to another. The new personality must be able
364 * to handle the data in the current layout.
365 * e.g. 2drive raid1 -> 2drive raid5
366 * ndrive raid5 -> degraded n+1drive raid6 with special layout
367 * If the takeover succeeds, a new 'private' structure is returned.
368 * This needs to be installed and then ->run used to activate the
369 * array.
370 */
371 void *(*takeover) (mddev_t *mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372};
373
374
NeilBrown007583c2005-11-08 21:39:30 -0800375struct md_sysfs_entry {
376 struct attribute attr;
377 ssize_t (*show)(mddev_t *, char *);
378 ssize_t (*store)(mddev_t *, const char *, size_t);
379};
NeilBrown43a70502009-12-14 12:49:55 +1100380extern struct attribute_group md_bitmap_group;
NeilBrown007583c2005-11-08 21:39:30 -0800381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382static inline char * mdname (mddev_t * mddev)
383{
384 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
385}
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387/*
388 * iterates through some rdev ringlist. It's safe to remove the
389 * current 'rdev'. Dont touch 'tmp' though.
390 */
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100391#define rdev_for_each_list(rdev, tmp, head) \
392 list_for_each_entry_safe(rdev, tmp, head, same_set)
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394/*
395 * iterates through the 'same array disks' ringlist
396 */
NeilBrownd089c6a2008-02-06 01:39:59 -0800397#define rdev_for_each(rdev, tmp, mddev) \
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100398 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
NeilBrown4b809912008-07-21 17:05:25 +1000400#define rdev_for_each_rcu(rdev, mddev) \
401 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403typedef struct mdk_thread_s {
404 void (*run) (mddev_t *mddev);
405 mddev_t *mddev;
406 wait_queue_head_t wqueue;
407 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 struct task_struct *tsk;
NeilBrown32a76272005-06-21 17:17:14 -0700409 unsigned long timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410} mdk_thread_t;
411
412#define THREAD_WAKEUP 0
413
414#define __wait_event_lock_irq(wq, condition, lock, cmd) \
415do { \
416 wait_queue_t __wait; \
417 init_waitqueue_entry(&__wait, current); \
418 \
419 add_wait_queue(&wq, &__wait); \
420 for (;;) { \
421 set_current_state(TASK_UNINTERRUPTIBLE); \
422 if (condition) \
423 break; \
424 spin_unlock_irq(&lock); \
425 cmd; \
426 schedule(); \
427 spin_lock_irq(&lock); \
428 } \
429 current->state = TASK_RUNNING; \
430 remove_wait_queue(&wq, &__wait); \
431} while (0)
432
433#define wait_event_lock_irq(wq, condition, lock, cmd) \
434do { \
435 if (condition) \
436 break; \
437 __wait_event_lock_irq(wq, condition, lock, cmd); \
438} while (0)
439
NeilBrown1345b1d2006-01-06 00:20:40 -0800440static inline void safe_put_page(struct page *p)
441{
442 if (p) put_page(p);
443}
444
NeilBrown92022952009-03-31 14:33:13 +1100445extern int register_md_personality(struct mdk_personality *p);
446extern int unregister_md_personality(struct mdk_personality *p);
447extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev),
448 mddev_t *mddev, const char *name);
449extern void md_unregister_thread(mdk_thread_t *thread);
450extern void md_wakeup_thread(mdk_thread_t *thread);
451extern void md_check_recovery(mddev_t *mddev);
452extern void md_write_start(mddev_t *mddev, struct bio *bi);
453extern void md_write_end(mddev_t *mddev);
454extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
455extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);
456
NeilBrown3fa841d2009-09-23 18:10:29 +1000457extern int mddev_congested(mddev_t *mddev, int bits);
NeilBrowna2826aa2009-12-14 12:49:49 +1100458extern void md_barrier_request(mddev_t *mddev, struct bio *bio);
NeilBrown92022952009-03-31 14:33:13 +1100459extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
460 sector_t sector, int size, struct page *page);
461extern void md_super_wait(mddev_t *mddev);
462extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
463 struct page *page, int rw);
464extern void md_do_sync(mddev_t *mddev);
465extern void md_new_event(mddev_t *mddev);
466extern int md_allow_write(mddev_t *mddev);
467extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
Dan Williams1f403622009-03-31 14:59:03 +1100468extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);
Andre Noll0894cc32009-06-18 08:49:23 +1000469extern int md_check_no_bitmap(mddev_t *mddev);
Andre Nollac5e7112009-08-03 10:59:47 +1000470extern int md_integrity_register(mddev_t *mddev);
NeilBrown72e02072009-12-14 12:49:55 +1100471extern void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
472extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
NeilBrown43a70502009-12-14 12:49:55 +1100473extern void restore_bitmap_write_access(struct file *file);
Christoph Hellwig63fe0812009-04-14 12:01:53 +1000474
475#endif /* _MD_MD_H */